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• Deterministic Multiplayer RTS game questions?

  - by Martin K

  I am working on a cross-platform multiplayer RTS game where the different clients and a server(flash and C#), all need to stay deterministically synchronised. To deal with Floatpoint inconsistencies, I've come across this method: http://joshblog.net/2007/01/30/flash-floating-point-number-errors/#comment-49912 which basically truncates off the nondeterministic part: return Math.round(1000 * float) / 1000; Howewer my concern is that every time there is a division, there is further chance of creating additional floatpoint errors, in essence making it worse? . So it occured to me, how about something like this: function floatSafe(number:Number) : Number {return Math.round(float* 1024) / 1024; } ie dividing with only powers of 2 ? What do you think? . Ironically with the above method I got less accurate results: trace( floatSafe(3/5) ) // 0.599609375 where as with the other method(dividing with 1000), or just tracing the raw value I am getting 3/5 = 0.6 or Maybe thats what 3/5 actually is, IE 0.6 cannot really be represented with a floatpoint datatype, and would be more consistent across different platforms?

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• Ubuntu slow on HP 2000 notebook with Apu e1-1200

  - by user169861

  I am using HP 2000 notebook which initially came with Windows 7 64bit. It has 4gb ram, AMD APU E1-1200 (1.4ghz) with Radeon 7310. With Windows it worked ok, so I decided to switch to Ubuntu. I installed 13.04 64bit at first, but responsiveness wasn't that good (opening windows, menus, Firefox, dash search) even if it was way better during the testing from live USB. I tried different kind of drivers for graphic card, 13.6beta, 13.4, fgrlx proprietary, upgraded kernel but the situation was the same. Then I tried installing 32bit version but the results were identical. After that I tried LTS version 12.04 and Xubuntu 13.04.. Responsiveness wasn't that different at all. Not sure what to do, and I wouldn't want to go back to Windows. This machine is not a beast, but it should be enough to deal with Unity or Xfce without troubles. Oh yes, I have insydeH20 BIOS with not so many options at my disposal. Thanks and best regards,

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• Is it a waste of time to free resources before I exit a process?

  - by Martin

  Let's consider a fictional program that builds a linked list in the heap, and at the end of the program there is a loop that frees all the nodes, and then exits. For this case let's say the linked list is just 500K of memory, and no special space managing is required. Is that a wast of time, because the OS will do that anyway? Will there be a different behavior later? Is that different according to the OS version? I'm mainly interested in UNIX based systems, but any information will be appreciated. I had today my first lesson in OS course and I'm wondering about that now.

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• Is it dangerous to substitute unit tests for user testing? [closed]

  - by MushinNoShin

  Is it dangerous to substitute unit tests for user testing? A co-worker believes we can reduce the manual user testing we need to do by adding more unit tests. Is this dangerous? Unit tests seem to have a very different purpose than user testing. Aren't unit tests to inform design and allow breaking changes to be caught early? Isn't that fundamentally different than determining if an aspect of the system is correct as a whole of the system? Is this a case of substituting apples for oranges?

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• HA Proxy and Disaster Recovery - Only access server if others are down?

  - by ben2004uk

  Why I expect this is not the best way to solve the problem, I got thinking tonight. I'm thinking about geo-locating servers. Given we have a load balancer + two servers to handle traffic in NA (North America) and one server in the EU. If the two US servers die, is it possible to get HAProxy to direct traffic automatically to the EU one. However, I don't want to use a roundrobin approach for the EU - just the two US ones. The EU should only be hit when the other two are down. Does anyone know how to configure HAProxy to do this? Thanks Ben

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• (int) Math.floor(x / TILESIZE) or just (int) (x / TILESIZE)

  - by Aidan Mueller

  I have a Array that stores my map data and my Tiles are 64X64. Sometimes I need to convert from pixels to units of tiles. So I was doing: int x int y public void myFunction() { getTile((int) Math.floor(x / 64), (int) Math.floor(y / 64)).doOperation(); } But I discovered by using (I'm using java BTW) System.out.println((int) (1 / 1.5)) that converting to an int automatically rounds down. This means that I can replace the (int) Math.floor with just x / 64. But if I run this on a different OS do you think it might give a different result? I'm just afraid there might be some case where this would round up and not down. Should I keep doing it the way I was and maybe make a function like convert(int i) to make it easier? Or is it OK to just do x / 64?

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• Best practices of texture size

  - by psal

  I wanted to know how should I determine a good texture size ? Currently, I always create UV texture that are 1024x1024px but if I create for example, a big house with a 1024px texture size, it will looks pretty bad. So, should I create different texture size (512, 1024, ...) for different mesh size like this ? : or is it better to always do high-resolution texture and then reduce it in the software (ie : increase the LODBias settings in UDK reduce the size of the texture) ? Thanks for your answer. ps : sorry for my english !

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• How can I create a symlink to the location that Ubuntu 10.10 mounts a CD?

  - by Michael Curran

  In Ubuntu 10.10, when I insert a CD or DVD into my optical drive, the system mounts the CD in a folder called /media/XYZ where XYZ is the disk's label. This has cause problems with Wine, as in order for an application to verify that an application's CD is present, Wine uses a symlinks to point to a mounted CD's folder. In this case, that folder must be /media/XYZ, but when using a different application, the folder would be different. I would like to know if there is a way to create a symlink that will always point to the mounted folder from a given /dev/cdrom* device, or how to force the system to always mount CDs to the same address (i.e. /media/cdrom).

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• How to work with scenes in a 2D game

  - by Anearion

  I'm a java/android programmer, but I don't have any experience in game programming, I'm already reading proper books, like "Pro Android Games", but my concerns are more about the ideas behind game programming than the techniques themselves. I'm working on a 2D game, something like Cluedo to let you understand the genre. I would like to know how should I act with the "scenes", for example, a room with a desk, TV, windows and a lamp. I need to make some items tappable and others not. Is it common to use one image (invisible to the user) with every different item a different color, then call the getColor() method on the image? Or use one image as background, and separate images for all the items? If the latter, how can I set the positioning? and should I use imageView or imageButton? I'm sorry if those are really low quality questions, but as "outsider" ( I'm 23 and still finishing my university ) it's pretty hard learn alone.

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• How can I autoclean my gnome main menu?

  - by Bruce Connor

  I like to experiment with lots of different software in my Ubuntu install. Then, every time Ubuntu reaches a new release cycle, I simply do a clean install (instead of upgrading) to get rid of all the extra software (and their respective config files/folders). The only thing I always backup and carry to the next install (besides personal files) are the config files for gnome, so my desktop is always the way I like it. =) The problem with that, is that the different packages I test out never get properly uninstalled, so my gnome main menu is full of broken links referring to software I had in previous installations (which got carried over because I kept the gnome config files). Is there any automated way to go through my gnome main menu and remove any broken links? I know how to manually edit the menu, and I could go through it myself, but I'm looking for some script or package that will clean for me so I wouldn't have to do it manually every release cycle.

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• Access Control Service v2: Registering Web Identities in your Applications [concepts]

  - by Your DisplayName here!

  ACS v2 support two fundamental types of client identities– I like to call them “enterprise identities” (WS-*) and “web identities” (Google, LiveID, OpenId in general…). I also see two different “mind sets” when it comes to application design using the above identity types: Enterprise identities – often the fact that a client can present a token from a trusted identity provider means he is a legitimate user of the application. Trust relationships and authorization details have been negotiated out of band (often on paper). Web identities – the fact that a user can authenticate with Google et al does not necessarily mean he is a legitimate (or registered) user of an application. Typically additional steps are necessary (like filling out a form, email confirmation etc). Sometimes also a mixture of both approaches exist, for the sake of this post, I will focus on the web identity case. I got a number of questions how to implement the web identity scenario and after some conversations it turns out it is the old authentication vs. authorization problem that gets in the way. Many people use the IsAuthenticated property on IIdentity to make security decisions in their applications (or deny user=”?” in ASP.NET terms). That’s a very natural thing to do, because authentication was done inside the application and we knew exactly when the IsAuthenticated condition is true. Been there, done that. Guilty ;) The fundamental difference between these “old style” apps and federation is, that authentication is not done by the application anymore. It is done by a third party service, and in the case of web identity providers, in services that are not under our control (nor do we have a formal business relationship with these providers). Now the issue is, when you switch to ACS, and someone with a Google account authenticates, indeed IsAuthenticated is true – because that’s what he is! This does not mean, that he is also authorized to use the application. It just proves he was able to authenticate with Google. Now this obviously leads to confusion. How can we solve that? Easy answer: We have to deal with authentication and authorization separately. Job done ;) For many application types I see this general approach: Application uses ACS for authentication (maybe both enterprise and web identities, we focus on web identities but you could easily have a dual approach here) Application offers to authenticate (or sign in) via web identity accounts like LiveID, Google, Facebook etc. Application also maintains a database of its “own” users. Typically you want to store additional information about the user In such an application type it is important to have a unique identifier for your users (think the primary key of your user database). What would that be? Most web identity provider (and all the standard ACS v2 supported ones) emit a NameIdentifier claim. This is a stable ID for the client (scoped to the relying party – more on that later). Furthermore ACS emits a claims identifying the identity provider (like the original issuer concept in WIF). When you combine these two values together, you can be sure to have a unique identifier for the user, e.g.: Facebook-134952459903700\799880347 You can now check on incoming calls, if the user is already registered and if yes, swap the ACS claims with claims coming from your user database. One claims would maybe be a role like “Registered User” which can then be easily used to do authorization checks in the application. The WIF claims authentication manager is a perfect place to do the claims transformation. If the user is not registered, show a register form. Maybe you can use some claims from the identity provider to pre-fill form fields. (see here where I show how to use the Facebook API to fetch additional user properties). After successful registration (which may include other mechanisms like a confirmation email), flip the bit in your database to make the web identity a registered user. This is all very theoretical. In the next post I will show some code and provide a download link for the complete sample. More on NameIdentifier Identity providers “guarantee” that the name identifier for a given user in your application will always be the same. But different applications (in the case of ACS – different ACS namespaces) will see different name identifiers. This is by design to protect the privacy of users because identical name identifiers could be used to create “profiles” of some sort for that user. In technical terms they create the name identifier approximately like this: name identifier = Hash((Provider Internal User ID) + (Relying Party Address)) Why is this important to know? Well – when you change the name of your ACS namespace, the name identifiers will change as well and you will will lose your “connection” to your existing users. Oh an btw – never use any other claims (like email address or name) to form a unique ID – these can often be changed by users.

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• Part 8: How to name EBS Customizations

  - by volker.eckardt(at)oracle.com

  You might wonder why I am discussing this here. The reason is simple: nearly every project has a bit different naming conventions, which makes a the life always a bit complicated (for developers, but also setup responsible, and also for consultants).  Although we always create a document to describe the technical object naming conventions, I have rarely seen a dedicated document  with functional naming conventions. To be precisely, from my stand point, there should always be one global naming definition for an implementation! Let me discuss some related questions: What is the best convention for the customization reference? How to name database objects (tables, packages etc.)? How to name functional objects like Value Sets, Concurrent Programs, etc. How to separate customizations from standard objects best? What is the best convention for the customization reference? The customization reference is the key you use to reference your customization from other lists, from the project plan etc. Usually it is something like XXHU_CONV_22 (HU=customer abbreviation, CONV=Conversion object #22) or XXFA_DEPRN_RPT_02 (FA=Fixed Assets, DEPRN=Short object group, here depreciation, RPT=Report, 02=2nd report in this area) As this is just a reference (not an object name yet), I would prefer the second option. XX=Customization, FA=Main EBS Module linked (you may have sometimes more, but FA is the main) DEPRN_RPT=Short name to specify the customization 02=a unique number Important here is that the HU isn’t used, because XX is enough to mark a custom object, and the 3rd+4th char can be used by the EBS module short name. How to name database objects (tables, packages etc.)? I was leading different developer teams, and I know that one common way is it to take the Customization reference and add more chars behind to classify the object (like _V for view and _T1 for triggers etc.). The only concern I have with this approach is the reusability. If you name your view XXFA_DEPRN_RPT_02_V, no one will by choice reuse this nice view, as it seams to be specific for this CEMLI. My suggestion is rather to name the view XXFA_DEPRN_PERIODS_V and allow herewith reusability for other CEMLIs (although the view will be deployed primarily with CEMLI package XXFA_DEPRN_RPT_02). (check also one of the following Blogs where I will talk about deployment.) How to name Value Sets, Concurrent Programs, etc. For Value Sets I would go with the same convention as for database objects, starting with XX<Module> …. For Concurrent Programs the situation is a bit different. This “object” is seen and used by a lot of users, and they will search for. In many projects it is common to start again with the company short name, or with XX. My proposal would differ. If you have created your own report and you name it “XX: Invoice Report”, the user has to remember that this report does not start with “I”, it starts with X. Would you like typing an X if you are looking for an Invoice report? No, you wouldn’t! So my advise would be to name it:   “Invoice Report (XXAP)”. Still we know it is custom (because of the XXAP), but the end user will type the key “i” to get it (and will see similar reports starting also with “i”). I hope that the general schema behind has now become obvious. How to separate customizations from standard objects best? I would not have this section here if the naming would not play an important role. Unfortunately, we can not always link a custom application to our own object, therefore the naming is really important. In the file system structure we use our $XXyy_TOP, in JAVA_TOP it is perhaps also “xx” in front. But in the database itself? Although there are different concepts in place, still many implementations are using the standard “apps” approach, means custom objects are stored in the apps schema (which should not cause any trouble). Final advise: review the naming conventions regularly, once a month. You may have to add more! And, publish them! To summarize: Technical and functional customized objects should always follow a naming convention. This naming convention should be project wide, and only one place shall be used to maintain (like in a Wiki). If the name is for the end user, rather put a customization identifier at the end; if it is an internal name, start with XX…

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• Best place to install apps

  - by t3ch

  I am completely new to Ubuntu and I must say AskUbuntu and you folks are of great help. So now when I have started installing and playing with apps, my question is what is the best place to install/download apps? Like in Windows it usually goes under your C: drive and then you manage it under Program Files. Linux structure is quite different with a different folder hierarchy. I have attached the directory structure of my machine as well. I thought this question would help lot of beginners.

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• Multi screen RDP in Windows 8.1 Enterprise

  - by bgs264

  I have just flattened my machine and installed Windows 8.1 Enterprise Edition. I have used the Hyper-V to create a virtual machine for my Software Development stuff, on my VM I have also installed Windows 8.1 Enterprise Edition. I want to have two screen support when using this VM (not using /span) Both the Hyper-V viewer and Remote Desktop give me a tickbox to "Use all my monitors for the remote session". However even with it ticked (and even when I tried the /multimon switch on the command line), I only get a single screen. Am I missing something - this should be supported in Enterprise edition, right? Is there some extra config I need to do on the RDP host? Forgive me if it's an obvious question, I'm more a developer and just stumbling through ;-) Cheers! Ben

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• How to increase the bus factor and specialize at the same time?

  - by bizso09

  In agile pair programming it is recommended to switch pairs every now and then so as to increase the bus factor of the team. That means, most people in the team should work on different parts of the system at different times so that everyone has an understanding of it. Now it is impssible that everyone has an expert level of understanding of each part of the system. That's because people are urged to specialize in one area of expertise. If you are an expert database admin, what's the point of working on the user interface of the system when you switch pairs? You will not be able to do such a high quality job as someone who has extensive experience in UI design. How can you increase the bus factor and make sure that you have specialization in your team?

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• Is a Single Texture Cube Map Possible?

  - by smoth190

  I'm currently developing a test project to explore OpenGL 3 texturing abilities. I have a simple cube, made of 8 vertices and 36 indices. I want each of the cubes faces to have a different texture, so I devised this texture: I made it obvious which sections I want visible (I hope...). In Direct3D, I once made a skybox, and I used a cubemap. However, I had to split it into 6 different textures. This is annoying and hard to manage, it would be nice to have just one texture. Is this even possible? I read somewhere that I could do this by duplicating vertices, is that a good idea? Someone else said I could do it in the shader, but that also baffles me...

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• multi-clients web application,should I use custom user controls or a common user control

  - by ValidfroM

  Say my company is going to build a complicated asp.net web form education system. One of the module is web based registration. To make it flexiable, we decide to use user control(ascx) with rule-engine (work flow) regulating all business logic behide them. Thus in future,for different clients, we can simply config basic existing rules or adding new rules.(Rules stored in db or XML per client). Now the question is how to deal with the user controls (ascx)? My opinion is for different client build diffrent user control from scratch. other voice is like reuse existing user controls.

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• Edit menu permission issue

  - by user3541568

  i'm an Lubuntu user, but i suppose it concerns everyone. For menu editing there are 3 GUIs: lxmed, menulibre, alacarte. great! Still the ISSUE is that if i start as administrator, for example: gram@gram-pc:~$ alacarte will edit menu, till the time i close app. it doesn't have permission for that... so nothing in menu has been changed... gram@gram-pc:~$ gksudo alacarte or root@gram-pc:/# alacarte will open completely different menu with completely different items... how can i grand permission to edit my-not-root-menu?

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• HLSL: Pack 4 values into 32 bit float.

  - by TheBigO

  I can't find any useful information on packing 4 values into a 32 bit float in HLSL. Ideally, what I want to be able to do in HLSL is: float4 values = ... // Some values where each component is between 0 and 1. float packedValues = pack32R(values); float4 values2 = unpack32R(packedValues); I realize that there will be precision limitations, and performance tradeoffs between different precisions in different methods. I'm just wondering what ideas are out there.

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• Application Integration Future &ndash; BizTalk Server &amp; Windows Azure (TechEd 2012)

  - by SURESH GIRIRAJAN

  I am really excited to see lot of new news around BizTalk in TechEd 2012. I was recently watching the session presented by Sriram and Rajesh on “Application Integration Futures: The Road Map and What's Next on Windows Azure”. It was great session and lot of interesting stuff about the feature updates for BizTalk and Azure integration. I have highlighted them below, definitely customers who haven’t started using Microsoft BizTalk ESB Toolkit should start using them which is going to be part of the core BizTalk product in future release, which is cool… BizTalk Server feature enhancements Manageability: ESB Tool Kit is going to be part of the core BizTalk product and Setup. Visualize BizTalk artifact dependencies in BizTalk administration console. HIS administration using configuration files. Performance: Improvements in ordered send port scenarios Improved performance in dynamic send ports and ESB, also to configure BizTalk host handler for dynamic send ports. Right now it runs under default host, which does not enable to scale. MLLP adapter enhancements and DB2 client transaction load balancing / client bulk insert. Platform Support: Visual Studio 2012, Windows 8 Server, SQL Server 2012, Office 15 and System Center 2012. B2B enhancements to support latest industry standards natively. Connectivity Improvements: Consume REST service directly in BizTalk SharePoint integration made easier. Improvements to SMTP adapter, to add macros for sending same email with different content to different parties. Connectivity to Azure Service Bus relay, queues and topics. DB2 client connectivity to SQL Server and SQL Server connectivity to Informix. CICS Http client connectivity to Windows. Azure: Use Azure as IaaS/PaaS for BizTalk environment. Use Azure to provision BizTalk environment for test environment / development. Later move to On-premises or build a Hybrid cloud approach. Eliminate HW procurement for BizTalk environment for testing / demos / development etc. Enable to create BizTalk farm easily and remove/add more servers as needed. EAI Service: EAI Bridge Protocol transformation Message Transformation Running custom code Message Enrichment Hybrid Connectivity LOB Applications On-premises Application On-premises Connectivity to Applications in the cloud Queues/ Topics Ftp Devices Web Services Bridge can be customized based on the service needs to provide different capabilities needed as part of the bridge. Look at the sample for EDI bridge for EDI service sample. Also with Tracking enabled through the portal. http://msdn.microsoft.com/en-us/library/windowsazure/hh674490 Adapters: Service Bus Messaging adapter - New adapter added. WebHttp adapter - For REST services. NetTcpRelay adapter - New adapter added. I will start posting more and once I start playing with this…

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• A program/command to help translate multiple file names

  - by cipricus

  I have hundreds of files with different names that I want to translate into a different language. Is there an application/CLI action that would allow me to copy all this names as in a list/table and then, after having translated them, to paste them back into the list/table, or that would allow a procedure somewhat similar to "Rename" in Thunar but with a more complex action closer to what I have described? (I am in Lubuntu and I prefer not to use Nautilus due to unwanted interference with LXDE/pcmanfm desktop and LXPanel. If there is a solution in Nautilus please provide it but try to give an alternative if possible.)

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• forked-daapd without avahi

  - by vixducis

  I'm trying to setup forked-daapd, but i'd prefer it if i could run it without avahi (or rather define my own avahi service instead of using the dbus api). The reason is that i want a netatalk share for my time machine backups and a samba share for the symbolic link support (netatalk doesn't support symlinks). Those two are defined as different services in avahi. To make that work, i have to disable avahi's dbus api, or else netatalk tends to take over all the services (osx prefers afp over smb). If I now try to start forked-daapd, it just doesn't. Forked-daapd requires avahi's dbus api to be enabled and running. Is there some sort of way around this limitation, so that i can manually define my own daap service in avahi. Maybe something like enabling but ignoring the dbus in avahi, or launching a duplicate avahi daemon with a different config file?

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• How to structure well my adwords campaign?

  - by Romain Dorange

  I am starting an adwords campaigns and I will measure conversion rates using the Adwords conversion tracking pixel. Conversion might be account creation or a concrete sale. As it will be a test campaign to have some insights on CTR, CR, etc... on the future, I am likely to try several configurations. two differents ads with different landing URL and messages : one with a focus on the product / the other will contains a discount embedded in the URL 4 differents groups/thematics of keywords I guess I have to build 4 ads groups based on the keywords 2 ads with the different messages assign the two ads to each ads groups follow the campaign precisely in the ads tabs where I can see the effectiveness of each Ads per Ads Groups (for a total of 8 lines of reporting) Am I right ? Also, what are the KPI I can have from an adwords campaign tu measure global effectiveness? measure of ROI from concrete sales (tracking pixel with e-commerce tag on confirmation page) measure of ROI from leads acquisition (tracking pixel on account creation) measure of traffic increase with the campaign Thanks a lot.

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• Why is it java code indented as BSD KNF Style and C C++ code indented as Allman or BSD style?

  - by Caffeine

  I do understand that coding convention is a matter of preference, and that different coding conventions have different subtle advantages or shortcomings, and depending on what one wants, one should choose his/her style. But why is usually Java written where the opening brace is on the same line as the function definition of control statement, and in C or C++ the curly braces have a line of their own? BSD KNF style if (data != NULL && res > 0) { if (JS_DefineProperty(cx, o, "data", STRING_TO_JSVAL(JS_NewStringCopyN(cx, data, res)), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } PQfreemem(data); } else { if (JS_DefineProperty(cx, o, "data", OBJECT_TO_JSVAL(NULL), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } } Allman or BSD Style if (x == y) { something(); somethingelse(); } Courtesy: http://en.wikipedia.org/wiki/Indent_style

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• How are crossplatform/multiple-OS C++ projects planned in terms of code and tools?

  - by Nav

  I want to create a project in C++ that can work in Windows, Linux and Embedded Linux. How are projects created when they have to work across many OS'es? Is it first created on one OS and then the code slowly modified to be ported to another OS? Eg: to me, the Linux version of Firefox appears to be created as a Windows project and a separate Linux project with a different code base, since Firefox behaves a bit different in Windows and Linux. Although the source code download is surprisingly a single link. If QT is used for UI, Boost threads for threading, Build Bot for CI and NetBeans/Eclipse/QT Creator for an IDE, would a person be able to minimise the amount of code re-write required to get the project onto another OS? Is this the right way to do it, or are such projects meant to be created as two entirely separate projects for two separate OS'es?

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